exam Maths Puzzle Numerical Ability

Hi I asked this question before but forgot something How do you figure out the area of an triangle with all sides equal and the only number given is 5 thanks

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exam Other Question
I need help solving these two problems.
x^2 - 3x = -6x - 1





x^2 - 10x - 1 = -10
 Graph each of the following quadratic equations after completing the given table of values.
y=-x^2- 2

x y
-2
-1
0
1
2